Johannes Kepler, a 16th-century scientist, believed the universe was created on this day in 4977 B.C. While modern science has disproved this theory, his laws of planetary motion were and made him the founder of celestial mechanics. This website from NASA explains Kepler's contributions to the study of planets.

Number to Know

22 million: Number of people who cast ballots in South Africa's 1994 election.

This Day in History

April 27, 1994: South Africa holds first mulitracial elections; Nelson Mandela is elected president.

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